Monday, 31 March 2008
I've only listened to the first few minutes, but this podcast from the BBC - "a discussion... which explores his why his theories on population growth are currently the subject of renewed debates" sounds worth a listen...
Sunday, 30 March 2008
Global Atmospheric Circulation
The tri-cellular model shown below goes some way to explain the global patterns of pressure, precipitation and winds... There is a nice, straightforward explanation of the tri-cellular model, along with Rossby waves and jet streams on the S-Cool site (click on the picture...).
Cool Temperate Western Maritime Climate...
(ie the type of climate we have...)
- located 40o to 60o N and S, mainly on western edges of continents
Make sure that your climate graph (blue bars for precipitation and red line for temperature... Bahrain!) is completed and that you can describe the characteristics of the climate... The data you used to plot your graph was for Sheffield... Remember that there is variation within the British Isles as illustrated by the rather nice maps in this Met Office Factsheet.
5 of them affecting the British Isles - Polar Continental (Pc), Arctic Maritime (Am), Polar Maritime (Pm), Tropical Maritime (Tm) and Tropical Continental (Tc).
The temperature of an air mass and its moisture content are dependent on the source region (hot or cold) and the path (over land or sea) of the air mass.
Types of rainfall
Three main types - orographic (relief), frontal and convectional. In all cases, warm moist air is rising and cooling, water vapour is condensing, clouds are forming and rain is falling. The key difference is what makes the warm air rise in the first place.
For the moment, we need to concentrate on frontal rainfall - where warm and cold air meet...
Mid-latitude depressions, or low pressure systems, are the most common weather system to affect the UK. Depressions can affect the UK at any time of the year and bring wet and windy weather.
Three main stages - embryo, maturity and decay - nicely summarised on the S-Cool site.
You need to be able to describe the changes in the weather patterns that occur with the passage of a depression, as well as being able to identify depressions on satellite images and synoptic charts.
A reminder here from the Met Office about station plots and what they mean...
And Postman Pat (courtesy of Tony Cassidy), should you want to watch again, is here!!
Saturday, 29 March 2008
The reason that Google has "turned the lights out" on its homepage is that today is the day of Earth Hour. Last year Sydney took a stand against climate change and switched off the lights for an hour... This year, it is a global event, with cities across the world switching off their lights for an hour at 8.00pm local time.
There's an interesting article from Time Magazine here
Will you be joining in? Leave a comment and let us know!
Thursday, 27 March 2008
Saturday, 22 March 2008
Sunday, 16 March 2008
Friday, 14 March 2008
Our eight places have been confirmed, so we just need to decide now who gets the golden tickets!
Wednesday, 12 March 2008
A reminder of the egg experiment:
How To Suck An Egg Into A Bottle
And the ruler/newspaper one:
How To Put A Ruler Under Pressure
Remember that we need to think back to Friday's lesson and the unequal heating of the earth's surface to understand why areas of high and low pressure develop.
Have a look here at the pressure charts and the surface pressure forecast, and have a go at predicting how the weather will change over the next few days!
Monday, 10 March 2008
Dan and the team will be entertaining the nation with 6 hours of Geography, starting at 3.30pm tomorrow (Tuesday)... You can watch - and rate their performance, send in questions, etc. online, and there will be a highlights show on BBC3.
Sunday, 9 March 2008
As I was passing the Natural History Museum on my way back to the tube, I remembered about the Ice Station Antarctica exhibition that is on until 20th April, so went in to have a look at that... The pair of scissors that live in my pencil case didn't go down well with the security guards at the entrance and so they, along with £7.00, were taken off me. The exhibition was aimed really at primary school children, but there were some interesting bits and pieces, including the opportunity to stand in a freezer room at about -100C (which would be a warm summer day in Antarctica!) and various games to play including driving a skidoo (which I was rather better at when I did it for real in Iceland).
Then off to Angel to meet Mrs Kambalu for dinner at the Afghan Kitchen...
Back to the new St Pancras International Station, where I had half an hour before my train to investigate the new Foyles bookshop, have a look at the famous clock and the infamous Meeting Place statue and cause great amusement to a man with a rubbish cart when I stopped to take a picture of the plaque that said that the huge girders had been made in 1867 at Butterley in Derbyshire!
We then looked at the earth's energy balance....
Although it is written for Scottish Highers, this bit of the BBC Bitesize website has a nice and fairly straightforward summary...
According to this article from the BBC, the worst storm of the winter is on its way... Have a look at the pressure chart forecast and see if you can work out what's going on...
Tuesday, 4 March 2008
(Photos - Flickr users sarchi and stevecadman)
For the nosy/curious ones amongst you, this is what I'll be doing...
In my absence, I would like you to do some reading about the uneven heating of the earth's surface. Mr Bradley will be happy to lend you a textbook if you want to borrow one, there is lots of info on the Higher section of the Met Office website, and lots of other bits and pieces out there... Make sure, also, that you are happy about the structure of the atmosphere from Friday.